Drilling/Tapping Forward Scope Rail Srew Hole?
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  1. #1
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    Default Drilling/Tapping Forward Scope Rail Srew Hole?

    Hi,
    I found an older Savage LH 110 Long Action in 22-250.

    It has the older size 6 screw holes for the rail and I want to upgrade to 8-40.

    All the holes are clear of course except the most forward one where the barrel is screwed in.

    Was wondering if I could just drill the forward hole to the barrel threads, and bottom tap it with out pulling the barrel???

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    It is a little trickier to do it that way, but you can do it. If I remember correctly, the trick is to us a jig or fixture so that you get perfect alignment, And depending on the depth of the hole use a taper or plug tap and finish with a bottoming tap.

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    Hi,
    Thanks, I have a Bridgeport so will see if I can get it in the vise and go from there.

    Bottoming tap has been ordered, also looking at using a mill cutter instead of drill bit for that hole to get as far down as possible (just on top of barrel threads) with the new hole!

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    Not gonna hurt to go to the bottom of the threads if you feel like it.

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    Hi,
    Thanks!

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    If you have headspace gauges and a wrench, it really is easier to pull the barrel.

    --
    Pat Jones
    Firestone CO

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    Quote Originally Posted by pat_j0nes View Post
    If you have headspace gauges and a wrench, it really is easier to pull the barrel.

    --
    Pat Jones
    Firestone CO
    I totally agree with Pat. I would say, however, that with a 22-250 you are not gaining anything with your changing from 6-48 to 8-40 screws.

    Bill Jacobs

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    Quote Originally Posted by seagiant View Post
    Hi,
    Thanks, I have a Bridgeport so will see if I can get it in the vise and go from there.

    Bottoming tap has been ordered, also looking at using a mill cutter instead of drill bit for that hole to get as far down as possible (just on top of barrel threads) with the new hole!
    9/64ths end mill (center cutting) will cut a good hole for an 8-40 tap.

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    ^^^^
    Yep.

    Good tutorial, pretty straightforward- much more so with a DRO.
    Screw spacing is listed in the article, also on M700 receiver shop prints online.


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